It boosted fourth-quarter GDP, which came in at a 5.7 percent annualized rate. How much it goosed the GDP is debatable. A report by Vice President Biden estimates that the stimulus added 1 to 3 percent to the 5.7 percent number.

The one thing we know: No one can say for sure how many jobs have been saved or created. Indeed, Republicans note that, over the past year, as unemployment has risen, 3 million jobs have been lost, despite the stimulus.